Transcription factor. Isoform 1 may function as an activator and isoform 2 as a repressor in tissues where both forms are expressed. May play a role in development. May be involved in epidermal differentiation (By similarity). Binds and transactivates the EN1 promoter.
Isoform 1 is highly expressed in brain, pancreas, tonsil, placenta and kidney. Isoform 2 is highly expressed in brain and liver. Highly expressed in placental JEG-3 cells and at very low levels in non-steroidogenic cells. No expression detected in adrenal NCI-H295A cells.
Belongs to the grh/CP2 family. Grainyhead subfamily.